[docs] Tutorial: write() does not expect string in binary mode (issue 26001)

https://bugs.python.org/review/26001/diff/16317/Doc/tutorial/inputoutput.rst File Doc/tutorial/inputoutput.rst (right): https://bugs.python.org/review/26001/diff/16317/Doc/tutorial/inputoutput.rst... Doc/tutorial/inputoutput.rst:277: file is twice as large as your machine's memory. Otherwise, at most *size* bytes Double space needed before the start of new sentence. https://bugs.python.org/review/26001/